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US3653931A
Expired / Lapsed
US
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Anti-tarnish composition for metal surfaces and process for its use
Assignee: Bayer Corp
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Filing: 1970-12-30
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Granted: 1972-04-04
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Expires: 1990-12-30
Abstract
Abstract The clean surface of metals, such as copper and coppercontaining alloys, can be protected from tarnishing by a composition containing a mixture of a surfactant, benzotriazole, sodium bisulfite and ethylenediaminetetraacetic acid. This composition is generally mixed with water and the clean metal surface is dipped in or otherwise contacted with the aqueous solution.
Inventors
- 👤 Peter Jochen Borchert
- 👤 James Edward Slager
- 👤 Ronald George Sommer
- 👤 Mitchell Frank Zienty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:17
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
A composition according to claim 1 wherein the surfactant is a nonionic octylphenylpolyethylene glycol ether.
Claim 2
Dependent Claim
17 words
A composition according to claim 2 wherein the surfactant has the formula: (C8H17) (C6H4) O (CH2CH2O)40 CH2CH2OH
Claim 3
Dependent Claim
54 words
An anti-tarnish liquid comprising an aqueous solution of the composition of claim 1, the components of said composition being present in said solution in the concentrations of 0.005 to 0.1 weight percent surfactant, 0.05 to 0.2 weight percent benzotriazole, 0.01 to 0.1 weight percent sodium bisulfite and 0.01 to 0.1 weight percent ethylenediaminetetraacetic acid.
Claim 4
Dependent Claim
16 words
An anti-tarnish liquid according to claim 4 having a pH from about 3.5 to about 8.0.
Claim 5
Dependent Claim
16 words
An anti-tarnish liquid according to claim 4 having a pH from about 4.5 to about 6.0.
References Cited (Backward Citations)
US3265620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |